PEX has a lifespan of 50+ years. Copper pipes have a lifespan of about 70. Both are permanent solutions.

They have the pros and cons. Both can freeze, but only copper pipes will actually burst. PEX never will. PEX offers way better flexibility and less joints, and easier connections (you literally just crimp it).

It’s your house but I wouldn’t be so quick to knock PEX. I did a whole new bathroom with it. Only thing I’d say to stay far far away from us CPVC. Avoid that shit like the plague as it’s basically a ticking time bomb